Aggregates serve as a means to encapsulate and manage related domain objects within a boundary, ensuring consistency and integrity. Understanding the scenarios in which aggregates are required is crucial for effective system design. It is also one of the most misunderstood concepts in Domain-Driven Design.

When considering aggregates within the context of bounded contexts (BC), it raises questions about their relevance:

- Why and when do you need an aggregate?
- Are aggregates exclusively an internal concern, relevant only within a specific BC, or do they extend their usefulness beyond these boundaries?
- Is there a difference between invariants as perceived from the outside of a BC/service and from the inside?

This talk delves into the nuanced world of aggregates, investigating their necessity, utility, and the significance of their boundaries. We explore the fundamental questions of why and when aggregates are essential in system design and how their presence contributes to maintaining consistency and integrity. Attendees can expect to gain insights into the practical implications of aggregates, fostering a deeper appreciation for their role in effective system design.